Apparently, there's an Anonyme Tango here on Delcamp, but you have to get to the French forums to download it. Since I speak zero French, I can't get there.
Not sure it's the same one, but I think it is.
The one on the French forum is an arrangement for 4 guitars. (Not that the language problem should stop you from having a look though
. I'm on all the other language forums including the Japanese one, and all I can say in Japanese is "sushi"! Remember there are English miniforums on each of the other language forums.)
The good news is that you'll find the score on "Dirk's guitar page" (google for it if necessary).
Classical Guitar Forum.
"Experience is something you don't get until just after you need it." - Steven Wright